/*
 * Copyright 1999-2012 Alibaba Group.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
/**
 * (created at 2011-5-21)
 */
package fm.liu.timo.parser.ast.stmt.dal;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import fm.liu.timo.parser.ast.expression.Expression;
import fm.liu.timo.parser.ast.fragment.Limit;
import fm.liu.timo.parser.visitor.Visitor;

/**
 * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
 */
public class ShowProfile extends DALShowStatement {
    /** enum name must equals to real sql while ' ' is replaced with '_' */
    public static enum Type {
        ALL, BLOCK_IO, CONTEXT_SWITCHES, CPU, IPC, MEMORY, PAGE_FAULTS, SOURCE, SWAPS
    }

    private final List<Type> types;
    private final Expression forQuery;
    private final Limit      limit;

    public ShowProfile(List<Type> types, Expression forQuery, Limit limit) {
        if (types == null || types.isEmpty()) {
            this.types = Collections.emptyList();
        } else if (types instanceof ArrayList) {
            this.types = types;
        } else {
            this.types = new ArrayList<ShowProfile.Type>(types);
        }
        this.forQuery = forQuery;
        this.limit = limit;
    }

    /**
     * @return never null
     */
    public List<Type> getTypes() {
        return types;
    }

    public Expression getForQuery() {
        return forQuery;
    }

    public Limit getLimit() {
        return limit;
    }

    @Override
    public void accept(Visitor visitor) {
        visitor.visit(this);
    }
}
